The authors show that the hyperboloid of one sheet and the hyperbolic paraboloid are ruled surfaces.作者证实:单叶双曲面和双曲抛物面是直线曲面.The mathematical model of the hyperboloid twist drill was introduced.介绍了以旋转单叶双曲面作麻花钻钻尖后刀面的数学模型.The...
看看这些红色矿物颗粒, 它们具有双晶以及完全解理.Look at these grains. They have twins and perfect cleavages.可用区内不允许存在电学或光学双晶.N o electrical or optical twinning shall be allowed in usable zones.斜长石通常呈白色,具有完全解理和聚片双晶.Plagioclase is usually white ...
经济作物有胡麻 、 油菜 、 黄花 、 杏 、 苹果等.Economic crops include flax, canola, yellow, apricot, apple and so on.胡麻是一种重要的油料作物.The flax is one of the important oil crops.胡麻籽中含有诸多的营养保健功能成分.Many nutrition health protection functional comp...
My son had a tantrum and banged his fist on the ground.我儿子大发脾气，一拳捶在了地上。I lost my temper and banged my book down on the desk.我大发雷霆，把书砰地往课桌上一摔。It is now high time he banged his colleagues' heads together.现在该是他敲打敲打同事们的...